Crucial - DDR5 - module - 8 GB - SO-DIMM 262-pin - 4800 MHz / PC5-38400 - unbuffered - CT8G48C40S5 - Laptop Memory - CDW.com
Crucial - DDR4 - module - 32 GB - SO-DIMM 260-pin - 2666 MHz / PC4-21300 - unbuffered - CT32G4S266M - Computer Memory - CDW.com
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Amazon.com: OWC 64GB (4 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with 27" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S64S) : Everything Else
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